# [−][src]Function mynewt::kernel::os::os_time_change_listen

    pub unsafe extern "C" fn os_time_change_listen(
        listener: *mut os_time_change_listener
    )

Registers a time change listener. Whenever the time is set, all registered listeners are notified. The provided pointer is added to an internal list, so the listener's lifetime must extend indefinitely (or until the listener is removed).

NOTE: This function is not thread safe. The following operations must be kept exclusive: o Addition of listener o Removal of listener o Setting time

- `listener`: The listener to register.

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)